Debate and discussion of any biological questions not pertaining to a particular topic.
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Hello , ladies and gentlemen I would like to ask a quick question, about nerve functioning.
Alright we all know that the brain does all of the work when it comes to thinking or (functioning) but could someone explain to me which nerve controls or regulates the heart or cirulatory nerve impules. I know that the human body has many nerves in fact we have many plexuses or series of nerves combined together but is their a single nerve in the brain that we can single out and say this nerve here in the left or right hemisphere of the brain controls this or when the nerve is damaged or pinched it does this or that.
If so I would be pleased to know and that also means that the human brain ( mind) is able to control specific body functions naturally just like breathing, but can we ourselves control a certain function, for Example: We can tell ourselves to hold our breath and stop breathing but the brain does this naturally when we sleep during REM. I think that is cool I understand the structure of that but is there a way that we can tell ourselves or our brains how much chemical hormone balance to release if this was possible the actions would be outrageous. Another example the release of more t-cells if this is possible let me know
My screen name is CXCR4
good bye ladies and gentlemen!!!!!!!!!
Hey! So today I just had a session on this... The peripheral nervous system (PNS) is divided into two parts: the somatic nervous system and the autonomic nervous system. The autonomic is further divided into the sympathetic and parasympathetic.
The PNS is everything that branches off the central nervous system (CNS). The somatic nervous system is our voluntary control. The autonomic, as you could infer, is involuntary. You cannot control it. The sympathetic controls our body under stressful situations by excreting certain hormones among other things. The parasympathetic controls our body when it is at rest.
As for the part of the brain that controls what you asked about, that would be the remnants of our ancestors' brain, the more primal part. It is the brainstem. It is divided into the medulla,the Pons, and the Midbrain.
Hope what I provided was helpful.
Thanks ,I believed you anserwed that for me I know that we have a voluntary and involuntary nervous system,but I guess you can say I forgot there responsibilty and functions. You made it seem more clear to me Thanks Plasmodesmata11, I brought this question up because I seen a movie but I know it's just a movie. The guy was some how able to manuelly or voluntary use his celiac plexus at free will.
Which is the largest of the autonomic plexuses, lying in front of the aorta at the level of the origin of the celiac artery and behind the stomach. I think that is crazy. lol ? hey do you think it could be possible???????
By the way what type of work do you do, are you a student ??? Any way you seem to have anserwed my question not many people did thank's
Once again!! lol
I am glad I could help. As to whether or not consciously controlling an autonomic function would be possible...
You'd have to think about it, so it would be a lot of hard work. Any other role it plays would also have to be thought of and consciously done. Again, hard work But very cool, I'd bet.
But I am a student, and I am currently attending afterschool lectures on anatomy, but right now my knowledge is limited, especially since I haven't taken anotomy yet. It was lucky I had just learned that. I am more interested in botany, however, and that is what I wish to pursue... So yeah.
Have a nice day!
It is important to note the sinoatrial (SA) node when mentioning heart rhythms as well. This provides sympathetic innervation of the myocardial muscle, the electrical signals are propogated the same way a defibulator works: a signal originates in the muscle fibres on the medial superior end and terminate on the inferior lateral aspect, this way it ensures the right sequence of events in heart rhythm.
The sinoatrial node can keep the heart beating alone, as to what nerve it's connected to, I haven't a clue.
Edited for typo's
Hey, thanks for the info dealing with the sinoartial node, I will try to find which nerve responisble for the controlment. But if you can find it as well when ever you get free time that would help me a great deal. I mean you broke it down beyond the celiac artery (sweet).
Also I found out that the Vagus nerve plays a vital role with nerves especially the cranial and medulla oblongata it extend all the way from the cranial to the anus nerve. You once said that the (SA )or sinoatrial node can keep the heart beating alone how. I still have not found actually what nerve but I think it is the Vagus nerve who is the boss Man of all this role playing. I appreicate your time elaborating about this topic thank you Biology -online scientist, doctors, teachers, and Students.
P.S. Good Luck to you , in your Work
when dealing with the nervous system you need to understand first and foremost that our current knowledge is by no means exhaustive. yes, the autonomic nervous system is described by medical textbooks as involuntary, but as you can see, there are exceptions to this. some people can in fact control their autonomic nervous system voluntarily - i have even seen a case of someone who could voluntarily lower his heart rate. such things are not accounted by the current description. As are, for example, the findings that in some blind people impulses from touch receptors project in the occipital lobe precisely in the visual cortex. Thus the interface between the peripheral and central nervous system is still far from understood in its mechanistic details.
As for the heart inervation, i believe the vagus nerve takes care of the parasympathetic inervation. as for the sympathetic inervation, it is pretty complex - see this drawing for example, for the Netter atlas of anatomy and physiology http://www.netterimages.com/images/vpv/ ... 0x0475.jpg
As for the pacemaker fibers of the heart, there is much more to be said. You need to understand that the SA node can maintain a steady rhythm of 80 beats/minute ON ITS OWN, without any nerves (it still does that if you take the heart out of the body and put in a bowl of nutritive serum. This is due to special self-depolarizing cells called pacemaker cells, and particularly to special sodium channels in the plasma membrane of these cells referred to as I-f (funny) channels. the molecular mechanisms are indeed fascinating, but not our point at least for now.
The heart also has multiple redundancy systems, in case the SA node fails to do its job for whatever reason: there is a second self-contracting node referred to as the atrioventricular node that can maintain a rhythm of 50 contractions/minute if the SA node fails to impose its higher rhythm, and even a thrid node referred to as the His bundle, that can maintain a rhythm of about 30 contractions/minute. Specialized conducting muscle cells in the heart collectively named by anatomists the Purkinje fibers (or Purkinje network) can transmit the signal from the His bundle to all the heart (the signal normally goes: SA node -> AV node -> His bundle -> Purkinje fibers).
Hope that clears things up a little.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
Hello, biology-online hope everyone reading this is doing fine . I would like to ask a quick question about pulomnary blood clotting. And also what is the difference between pulomnary blood clotting in the artries or lungs v.s. blood clotting in general, for instance a cut or bullet wound that scabs later on the body.
I thought scabs or scars in the healing process was a form of blood clotting.
If you can figure this out for me it would help thanks
talk to you later
I am one of the exceptions to this. I can control my iris contraction/dilation of each eye individually. These multi-unit smooth muscles are considered an involuntary muscle group. Involuntarily reacting to light changes. It would be nice to know if this is harmful, because since I've learned to control them they will sometimes react on their own without light changes due to passing thoughts.
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